USER'S
INFORMATION
MANUAL
For
Models
NT.12SE
.
NT.16SE
.
NT.2OSE
This book contains
instructions
for operating and
maintaining the
furnace.
Keep with unit
at all times.
Should
you
require
further
information, contact
your
dealer or nearest Suburban
Service
Center.
WARNING!
lnstallation
of this
appliance
must
be
made
in accordance
with
the
written instructions
provided
in
this
manual. No agent,
representative or
employee of
Suburban
or
other
person
has the authority
to change,
modify
or
waive
any
provision
of the
instructions
contained in this
manual.
WARNING! Be sure
the
furnace and all
ignition
systems
are
"OFF"
during
any
type of refueling
and
while
vehicle
is in
motion
or being
towed.
WARNING!
lmproper
installation,
adjustment,
alteration,
service
or
maintenance can cause
property
damage,
personal
injury or loss of
life. Refer to the
installation
instructions and/or owners
manual
provided
with
this
appliance.
SUBURBAN
MANUFACTURING
COMPANY
Post Office
Box 399
Dayton,
Tennessee 37321
Due to high temperatures,
the unit should
be located out
of traffic
and
away from
furniture and draperies.
Ghildren
and adults
should be alerted
to
the hazards
of high
surface
temperatures
and should
stay away
to avoid
burns or clothing
ignition.
Young
children
should
be carefully
supervised
when they
are in the
same
room
as the
unit.
Clothing or other
flammable
material should
not be
placed
on or
near the
unit.
Any safety screen
or
guard
removed
for servicing the
unit must
be
replaced
prior
to operating
the unit.
The area
around
the unit must
be kept
clear from combustible
materials,
gasoline
and
other Ilammable
vapors and
liquids.
lnstallation and repairs
should be
done by a
qualified
service
person.
The unit should be inspected
before
use and
at least annually
by a
qualified
service
person.
More frequent
cleaning
may be required
due to
excessive lint from carpeting,
bedding
material,
etc. lt is
imperative that
control compartments,
burners,
and
circulating
air
passageways
of
the
unit be kept clean.
Suburban
Manufacturing
Company
a subsidiary
or
AIRXCEL'
lnc.
\-.
\-
WARNING:
lf the
information
in this
manual is
not followed
exactly,
a
fire or
explosion
may result
causing
property
damage,
personal
injury
or loss of
life.
-
Do not store
or use
gasoline
or other
flammable
vapors and
liquids
in the
vicinity of this
or any
other appliance.
-
WHAT
TO DO IF
YOU SMELL
GAS
.
Extinguish any open
flame.
.
Evacuate all
persons
from the
vehicle.
.
Shut
off the
gas
supply
at
the
gas
container
or source.
.
Do not touch
any electrical
switch,
or
use any
phone
or
radio
in the
vehicle.
.
Do
not
start
the
vehicle's
engine
or
electric
generator.
.
Gontact
the
nearest
gas
supplier
or
qualified
service
technician
for
repairs.
.
lf
you
cannot
reach
a
gas
supplier
or
qualified
service
technician,
contact
the
nearest
fi re department.
.
Do not turn
on the
gas
supply
until
the
gas
leak(s)
has been
repaired.
-
lnstallation
and
service
must be
performed
by a
qualified
installer,
service
agency
or the
gas
supplier.
Form
No.2465-C
MAINTENANCE
AND CLEANING
and/or
the
production of
carbon
mr'r:lxide
exists
ri!:,lh
can cause
hare^n.l iniirrv nronerlv demaoe or lgss
of life.
!-ARNING!
It the
:er
rl
ll
I applianc;
iails
io
maintain
it in ihe
condition
in which
it was shipped
irom the
lactory or
it the appliance
is
not usia
sotety
tor
its
intenddd
purpose
or
if
appliance
is.not
maintained
in accordancswith
the
instructiona
in
thi!
"nanual,
thcn
the risk of a
fire
CAUTION:
Label all
wires
belore
disconnecting
for
servicing'
Proper
oolaritv must be
observed
so the
furnace
molor
will
run with the
proper
Eiri"ri6n of
rotation
to
insure
correct
air delivery.
(See
wiring diagram)'
CAUTION:
Label all
wires
prior
to
disconnection
when servicing.controls'
Wiring erro,
can
cause
improper
and dangerous
lurnace operation'
Always
verily
proper
operation
ot
turnace
after
servicing'
Your
lurnace
should
be
inspected
by a
qualitied
service
agency
yearly
riJror6irriiing
rhe
lurnace
oir.
Partictilar
attention
should
be
given
to the
tollowing
items.
1 . lnsoect furnace
installation
and
vent termination
lo be sure
Iurnace
is
properly
ii,.iiiio
li.,,
pir6J (SLe lnstallation
lnstructions)'
that
vent terminates
to lhe
ii,iorpt"i.fino'inat
vent
tubes
overlap
properly
(See
Installing
Vent
Assembly).
2. lnsDect
chamber
and
venting
to assure
that
these
components
are
physically
siu.Ol
*,tnort
nolei or
exceJsive
corrosion
and that
the
installation
and/or
ie-iniiif
f
aiion
is in accordance
with Suburban's
lnstallation
lnstructions.
(Reference
installation
manual
supplied
with
furnace.)
WARNING!
lt is
imperative
that
the
products
ol
combustion
be
properly
vented to
atmosptiere
and
that
all
combustion
air supplied
to burner
be
drawn
trom outside
atmosPhere'
3. Check
the
base
on
which
furnace
is mounted.
Be sure
it
is
physically
sound'
void of any
sagging,
deterioration,
etc.
4.
lnsoect
furnace,
the
venting
and
the
gas piping
to
furnace
for
obvious
signs
of det6rioration.
Correct
any
defects
at once
5- lnsDect combustion
chamber
lor restrictions
in exhaust
or
intake
ll is
irojiStiue that the
flow
of
intake combustion
air
and the
flow
of
exhaust
gases
u"Ino
"ioltt"a
to the
outside
atmosphere
not
be
obstructed
Any soot or
loose
debr"is
should
be
blown
out
using
compressed
air.
6.
lnsoect
all
qaskets.
lf any
gaskets
show
signs ol
leakage or
deterioration,
idptaiE tt
L..
Biie operation
o-f
the
furnace
depends
on
all
gaskets
being
tight'
7. lnspect
return
air
inlet openings
to
the
furnace.
Bemove
any
restrictions
to
assure
adequate
air
flow.
You, as
the owner/user,
should
inspect
the
furnace
monthly during
the
heaiino season
for
oresence
of
soot
oh
vent. Operating
the
furnace
under
this
lJnJiii6n
corto
ieid'io serious
property
damage.
persohal iniury or
loss ot
life
itiooi
is ouser"d
on the
vent,
imriedihtely
shut
the
furnace down
and contact
a
qualified
service
agencY.
Listedbelowareseveralsafetyrelateditemsthatyoushouldfol|owduringthe
heating season
to
assure
continued
safe
operation
ol
the
furnace'
1 . lnsDect
furnace
venting.
Venting
must be
free of obstructions,
void of soot
and
propeily
terminated
to
the
atmosphere.
WARNING!
Do
not install
screens
over
the
vent
lor
any
reason' Screens
*iri
riliorei""tricted
and
cause
unsafe
furnace
operation'
Accessories
marketed
tor RV
products which
we do
not recommend.
For
v. onlv
factory
authorized
parts
are
to be
used on
your
tqnace'
afe
2. Periodically observe
the
main burner
flame to assure
it is burning
with a
hard
blue
flame with
well
defined
burner
ports (See
Figure
2). lf flame appears
yellow
or burner
has a
lazy flame, shut
furnace down.
lt is
possible
that burner
needs
cleaning or
replaced.
To inspect the
ntain burner,
remove the
four
(4)
screws-(A,
B,
C and
D) s'ecuring
the burner
access door to
the combustion
chamber
(See
Figure 1). li excessi-ve
rust and corrosion
are
present
on burner
surface,
the
bu-rner
must
be thoroughly
cleaned or
replaced.
The burner
may
be
cleaned
using
a
steel
wire
brusl-iand
blown
clean using
high
compression
air. Contact
a
qualifled
service
person
for assislance.
NOTE: To
observe
flame, cabinet
fronl
must
be
removed.
Operation
o{ burner
can
then be€bserved
through
the
viewing window
on
front
of chamber.
(See
Figure 1.)
3.
Periodically
inspect the
vent
for
obstructions
or
presence
ol soot.
Soot
is
formed when6ver iombustion
is incomplete.
This
is
your
visual warning that the
furnace
is
operating
in an unsale
manner.
l{ soot
is
present,
immediately shut
Iurnace down
and contact
your
dealer
or a
qualilied
service
person
4.
Keep furnace clean.
More
frequent cleaning
may
be
required
due
to excessive
lint from carpeting.
bedding
material, eta.
lt
is imperative that
control
compartments,
buriers
and ciiculating
air
passageways
of the appliance
be
kept
clean.
5.
The motor is
permanently
lubricated and
requires no oiling
6.
Keep
the
furnace area
clear
of any combustible
materials,
gasoline
or
other
llammable
vapor and
liquids.
7.
Before
operating
furnace, check
the
location of the
lurnace
vent to
make
sure
it will not be bloclied
by the
opening
of any door
on the trailer.
lf it
can
be
blocked, do
not operate
the
lurnace
with
the
door open.
8.
Do
not restrict the
flow of combustion
air
or the
warm air circulation
10 the
furnace. To do so could
cause
personal
injury and/or
death.
9.
Never ooerate the
furnace if
you
smell
gas.
Do not assume
that the smell
of
oas
in
your
RV
is normal.
Any
ttme
you
detect
the odor
of
gas.
it is to be
donsidered
life
threatening
and corrected
immediately.
Extinguish any open
tlames including cigarettes
and
evacuate
all
persons
from
the
vehicle. Shut
off
gas
supply at
LF
gas
bottle.
(See
safety
notice on
front
cover
of this
manual
)
10.
lmmediately shut
furnace down and
call a
service agency
i, furnace cycles
erratically or delays
on
ignition.
WARNING! Should
overheating
occur,
or the
gas
supply
fail to shut
off,
shut
ofl the
manual
gas
valve to
the appliance
before
shutting
oft the
electrical
11. Never attempt to
repair damaged
parts.
Always
have
them
replaced by a
qualif
ied service agency.
12. Never attempt
to
repair the
furnace
yourself.
Seek
the
help ol a
qualilied
service
person.
13.
Clothing
or other
flammable
material should
not be
placed
on or
near the
appliance.
14. Always follow the
Operating
Instructions.
Do
not
deviate
from the step-by-
step
procedures.
1 5. ln any
installation
in which the
vent ol
this appliance
can be
covered due
to
the consiruction o,
the
R',/ or some
special
feature of the
RV
such
as slide
out,
ooo-uo etc. alwavs
insu'e that
the apoliance
cannot
be operated
by setting
the
indrmbstat to
thd
positive'OFF'poiiiion and
shutting
off all
electrrcal
and
gas
supply
to the appliance.
Never
operate
furnace
with
vent
covered.
16. When considering
add-on
rooms,
porch
or
patio,
attention
must
be
given
to
the
venting
of
your
luinace.
For
your
safety,
do
not terminate
furnace vent
inside
add-on
ro6ms, screen
porch
oionto
patibs.
Doing
so
will result
in
products
of
combustion
being
vented
into the
room or occupred
areas.
HIGH
YELLDV
BLUE FLAME
BURNER
CIRRECT
INCT]RRECT
FLAME
FLAME
Figure
2
2
CEI.,IBUSTION CHAMBER
BURNTR
DBSERVATI!N
V]NDOV
CABINTT
ELECTRDDE
VALVE
GAS
T]TTING
BURNER
ACCESS DEDR
SPARK
V]RE
Figure
1
OPERATI
NG INSTRUCTIONS
WARNING: Do not operate furnace while
vehicle is in motion
or beino towed.
NOTE: During initial firing of this furnace a burn-off
of excess
paint
and oils remaining from manufacturing
process
may
cause
"smoking"
for 5
-
'10
minutes.
FOR YOUR SAFEW READ BEFORE
OPERATING
- -
ARNING:
lf
you
do
not
follow these instructions
exactly,
a
fire
or
explosion
may result causing
property
damage,
personal
injury
or loss of
life.
A" This appliance does
not have a
pilot.
lt is
equipped
with an ignition device
which automatically lights the
burner. Do not light the burner by hand.
B. BEFORE
OPERATING
smell
all around
the
appliance
area for
gas.
Be sure
to smell next to the floor because
some
gas
is heavier than air and will settle
on the floor.
WHAT TO DO IF YOU SMELL
GAS
.
Extinguish any open flame.
.
Evacuate all
persons
from lhe
vehicle.
.
Shut off
the
gas
supply
at the
gas
container or source.
.
Do not touch any electric
switch or use any
phone
or radio in the vehicle.
.
Do not start the vehicle's engine or electric
generator.
.
Contact
the
nearest
gas
supplier
or
qualified
service technician
for
repairs.
.
lf
you
cannot reach
a
gas
supplier or
qualified
service technician,
contact
the
nearest flre
department.
.
Do nct turn
on the
gas
supply until the
gas
leak(s) has
been repaired.
C. Use only
your
hand
lo turn the handle
cn
the
manual
shut offvalve. Never
use
tools. lf the
handle will not turn
by hand, don't try to
repair it, call
a
qualified
service
technician. Force
or attempted repair may
result in
a
fire
or explosion.
D. Do
not use this appfiance if
any
part
has been under
water. lmmediately
call
aqualified service
technician to inspect the
appliance
and to replace
any
part
of the
control system and any
gas
control which has
been under
watei.
'
OPERATING INSTRUCTIONS
\-"
1. STOP!
Read the
safety
information
above on this label.
2. Set the
thermostat
to
lowest setting.
3. Turn off all electric
power
to the appliance.
4. The appliance is equipped
with an
ignition
device
which
automatically lights
the burner. Do not try to light
the burner by hand.
5. Turn shut-off valve to
"OFF".
This furnace
is
equipped wrth a valve
shut-off
switch.
With
switch
in
"OFF"
position, gas
will not flow
to burner nor will the
furnace operate.
6. Wait flve
(5)
minutes to clear
out any
gas.
Then smell for
gas
including
near
the floor. lf
you
then smell
gas,
STOP!
Follow
"B"
in the safety information
above
on
this label. lf
you
don't smell
gas, go
to
next
step.
7.
Turn on all electric
power
to the appliance. These
units are for
use with LP
gas
only. LP
gas
is heavier then air. Therefore,
to better
clear out any
gas,
the heater
should be operated
for five
(5)
minutes with the
blower
on and the
gas
off.
8. Turn
shut-off valve to
"ON".
9.
Set
thermostat
to desired setting.
10. lf the appliance
will not operate, follow the instructions
"To
Turn
Off
Gas
to
Appliance"
and call
your
service technician or
gas
supplier. NOTE:
lf the
furnace should lock-out,
the blower will
go
off in
5 minutes
and remain off
until
unit
is
reset by reactivating thermostat.
TO
TURN OFF GAS TO APPLIANCE
1.
Set
the thermostat to
lowest
setting, then move lever to
"OFF"
position.
3. Turn
shut-off valve to
"OFF".
Do not force.
2.
Turn off all electric
power
to
the appliance if service is to
be
performed.
v,
v
@'
2
\
35
37i
39\l
\ 1.,
,v'
('r,.-.1
1B
-
L'-.L's
40.
Figure
3
43
,
3
S
,tt
)4
Figure
4
Figure 5
n
t
REPLACEMENT
PARTS LIST
Models
NT.12SE
.
NT-16SE
.
NT-2OSE
Only
factory
authorized
parts
are to be used.
Do
not attempt to repair defective
parts.
When
ordering
repair
parts
from
your
dealer,
a
Suburban Service Center,
or distributor,
always
give
the following
information.
1. Part
Number
(Not
ltem No.)
2. Part
Description
3.
Model
No., Serial No. and
Date Code
of
Furnace
4. Number
of
Parts Required
Y.,
Item
No.
1
2
4
5
6
7
I
o
10
10A
11
1'1A
12
14
17
1B
19
20
21
214
22
24
28
29
30
31
34
35
36
38
40
41
42
43
44
45
46
47
48
50
5'r
54
56
57
58
59
60
61
62
63
64
65
Part Number
NT.12SE
NT.16SE
NT.2OSE
161154
161154
16115/
121224
121224
121224
121520
121520
121520
030785P8
030785P8
030785P8
030785SG
030785GL
101887
'101887
10',1887
070569
070569
070569
050712
050712 050712
05071
1 05071 1
05071 1
050708
050708
050708
260098
260098
260098
121853
121853
121853
062476
062476
062476
121247
121247
121247
230933
230933
230933
121364
121364 12',t3M
120672
120672
120672
0208848K
0208848K
0208848K
1213AA 121388
121388
120158
120158
120158
070243
070243
070243
230635
230635
230849
120158
120158
120158
120714
120714 120714
230714
230714
230714
120158
120158
1201s8
120158
120158
120158
070270
070270
070270
121357
121357
121357
520820
520820
520820
062392
062392 062392
120158
120158
120158
070450
070450
070450
120717
120717
120717
120153
120158
120158
350082
350082
3s0082
't20158 120158 120158
3902228K
3902228K
3902228K
12',t329
121329 121329
070446
070446 070446
120722
120722
120722
3902238K
3902238K
390223BK
530089 530089 530089
070448
070448
070448
230616
230634 230634
350083
350083 350083
062290
062290
062290
121407
121407 121407
231931
231931 231S31
070163
070163 070163
121388
121388 121388
120717
120717 120717
030621 030621
030621
070398
070398 070398
170374
170374 170374
't61',t23
'161123
161123
062288
062288
062284
120158
120158 120158
170744
170744 170744
120615 120615
1206'15
180225
180224 180231
070449 070449 070449
010614 010614 010614
063249 063249 063249
232351
232351
232351
12015A 120158
'120158
Description
Thermostat
(Suburban
supplied
themstat not
appli€ble to some
models)
Screw, #1 0 x 3i4
(2
Required)
Screw, #8 x 3/8
(2
Required)
Cabinet
Front
(BroM)
Cabinet Front
(Gray)
Cabinet Front
(Light
Gray)
Cabinet
Bushing
Tube, lntake
(Standard) (5'Long)
Tube, lntake
(Special) (2
3/4' Long)
Tube, lntake
(Special) (7
3/4" Long)
Vent Cap and
Exhaust Tube
Asembly
Screw, #10 x 3i4
(6
Required)
Bracket, Microswitch Mounting
Screw, #2
-
56 x 5/8
(2
Required)
Microswitch Assembly
Washer Lock #2
(2
Required)
Nut, Hex #2-56
(2
Required)
Combustion
Chamber/Shield
Assembly
Screw,
#10 x'112 With Serated
Head
(2
Required)
Screw, #8 x 3/8
(2
Required)
Grcmmet
Limit Switch
Screw, rlS x
3/8
(2
Required)
Screw,
#6 x 1/4
(2
Required)
Splicer
Screw, #8 x 3i8
(2
Required)
Screw, #8 x 3/8
(2
Required)
Bushing
Screw, #6
x
5/8
(2
Required)
Module
Board
Stiffener Bracket. Combustion
Air
Housing
Screw, #8 x 3/8
(2
Required)
Gasket, Bumer Tunnel
Nut
'10-24
Hex Lock
(2
Required)
Screw, #8 x 3/8
(2
Required;
Wheel, Combustion
Air
Screw, #8 x 3/8
(9
Required)
Box, Combustion
Air
(Outside)
Assembly
Nut 10-32 Hex Lock
(2
Required)
Gasket, Combustion Air Box
Washer, Flat
(2
Required)
Box, Combustion
Air
(lnside)
Assembly
Grommet
(2
Required)
Gasket, N.4otor
Motor
lmpeller, Room Air
Bracket, CombJStion
Air Housing
Mounting
Screw,
#8
-
32 Self Tapping
(2
Required)
Electrode
Gasket, Electrode
Screw, #10 x 1/2 Serrated
Head
(4
Required)
Nut 10-24 Hex
Lock
(2
Required)
Door, Burner
Access
Gasket,
Burner Access Door
Gas Fitting
Valve
Bracket,
Manifold
N,lounting
Screw, #8 x 3/B
(2
Required)
Manifold Assembly
Screw, #8 x 1/2
(4
Required)
Orifice, Main Burner
Gasket, Manifold
Burner Assembly
Bracket, Switch, Mounting
Switch,
ON/OFF
Screw. #8 x 3/8
Y-/
6
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